/*
 *  Copyright (c) WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 *  WSO2 Inc. licenses this file to you under the Apache License,
 *  Version 2.0 (the "License"); you may not use this file except
 *  in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.wso2.balana;

import org.w3c.dom.Node;

import java.util.HashMap;

/**
 * Factory that creates the AbstractTarget
 */
public class TargetFactory {

	private static volatile TargetFactory factoryInstance;

	/**
	 * Returns AbstractTarget based one the XACML version
	 * 
	 * @param node
	 *            DOM node
	 * @param metaData
	 *            policy meta data
	 * @return <code>AbstractTarget</code>
	 * @throws ParsingException
	 */
	public AbstractTarget getTarget(Node node, PolicyMetaData metaData)
			throws ParsingException {

		if (XACMLConstants.XACML_VERSION_3_0 == metaData.getXACMLVersion()) {
			return org.wso2.balana.xacml3.Target.getInstance(node, metaData);
		} else {
			return org.wso2.balana.xacml2.Target.getInstance(node, metaData);
		}
	}

	/**
	 * Returns an instance of this factory. This method enforces a singleton
	 * model, meaning that this always returns the same instance, creating the
	 * factory if it hasn't been requested before.
	 * 
	 * @return the factory instance
	 */
	public static TargetFactory getFactory() {
		if (factoryInstance == null) {
			synchronized (TargetFactory.class) {
				if (factoryInstance == null) {
					factoryInstance = new TargetFactory();
				}
			}
		}

		return factoryInstance;
	}
}
